CN101179789A - Backlight brightness self-adjusting mobile phone and implementing method thereof - Google Patents
Backlight brightness self-adjusting mobile phone and implementing method thereof Download PDFInfo
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- CN101179789A CN101179789A CNA2007101128801A CN200710112880A CN101179789A CN 101179789 A CN101179789 A CN 101179789A CN A2007101128801 A CNA2007101128801 A CN A2007101128801A CN 200710112880 A CN200710112880 A CN 200710112880A CN 101179789 A CN101179789 A CN 101179789A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a method for automatically regulating the backlight brightness of a cell phone, which includes the following steps: a camera is set into a standby mode with low power consumption by a cell phone processor; whether an issue occurs is determined, such as pressing key or incoming call; in case of an issue, the camera is set into a working status by the processor and collects image data then transmits the data to the processor which receives the image data and calculates the brightness value of the current image then sets the camera back into the standby status with low power consumption; then whether the brightness value of the current image is larger than the preset brightness value is determined; if the brightness value of the current image is larger than the preset brightness value, the backlight brightness value level is decreased, otherwise the backlight brightness value level is increased. By adopting the method, the power consumption of backlight of the cell phone is effectively decreased, and the standby time of the cell phone is prolonged.
Description
Technical field
The invention belongs to the mobile communication terminal technical field, specifically relate to regulate the mobile phone of backlight illumination and the method for regulating backlight illumination.
Background technology
Because mobile phone is to use battery powered portable terminal product, therefore the stand-by time of mobile phone is an important indicator of mobile phones design always, in order to prolong the cell phone standby time, except the capacity that increases battery of mobile phone, reducing the power consumption of each product device in the mobile phone as much as possible, is to solve another direction how the cell phone standby time prolongs.
In order to make mobile phone that operating effect preferably all be arranged in any environment, mobile phone generally uses KBD-LIGHT and LCD backlight, and the operating current of two backlights can reach 80mA or more, and the electric current under the normal standby of mobile phone can not surpass 5mA.If often light the KBD-LIGHT and the LCD backlight of mobile phone by day under the bright light environments, many consumption battery of mobile phone energy that will be unnecessary.Under than the bright ring border, in order to reduce the current sinking of mobile phone on backlight, the solution that usually adopts is to adopt a light-sensitive device (as photo resistance, photodiode, light sensor etc.) thereby come to regulate the backlight and LCD brightness backlight of cell phone keyboard automatically according to current environment brightness at present, reaches to prolong the mobile phone purpose of service time.
But increase a light-sensitive device and also have following problem in mobile phone: one is the cost problem, owing to need select light-sensitive device in the mobile phones design for use near the human eye sensitivity curve, human eye is to the light sensitive of 400nm to the 700nm wavelength, and this class light-sensitive device price is higher, the less employing of low and middle-end mobile phone.Another is a structure problem, reaches photosensitive effect preferably in order to make light-sensitive device, need carry out shielding on handset structure, shields the interference of backlight to light-sensitive device as far as possible; And need size, the shape to light-conductive hole make appropriate design on shell mechanism, light-conductive hole is can not perforate excessive to cause influencing outward appearance, again can not perforate too small so that gather insufficient light.
By above description to prior art as can be known, increase light-sensitive device and be difficult to extensive use owing to cost problem and structural problem, based on this, the problem to be solved in the present invention is how can not increase cost and realize that effectively mobile phone regulates the backlight illumination of keyboard and LCD automatically.
Summary of the invention
Purpose of the present invention, just be on the basis that does not increase light-sensitive device, by the photodiode that mobile phone cam self is integrated surrounding environment is realized that brightness detects, regulate backlight illumination automatically, reach the purpose that reduces the consumption of mobile phone back facet current, reduces mobile telephone power consumption.
With respect to the operating position of light-sensitive device in the mobile phone, the embedded in mobile phone camera has become a basic function of mobile phone, no matter is high-end mobile phone and low-end mobile phone, and integrated camera function has become a kind of trend.Difference according to camera resolution, camera inside is made up of to millions of photodiodes hundreds of thousands, and the view data of these photodiode collections carries out being transferred to after the necessary image processing that CPU shows and store through the camera processor inside.
Under standby status of mobile phone, camera is set is in holding state, mobile phone self power consumption is less; Taken place at mobile phone under the incident of needs work backlight such as button is pressed, phone incoming call, mobile phone can dispose camera and enter operating state, gather a frame or a few two field picture, judge current environment brightness, regulate mobile phone backlight illumination grade then according to the image data processor analysis.
For achieving the above object, the self-regulating method of mobile phone backlight illumination may further comprise the steps:
It is the low-power consumption standby pattern that the handset processes device is provided with camera;
Judge whether that event occurs, such as key-press event or phone incoming call incident;
If event occurs, then processor is provided with camera and enters operating state, the camera collection view data and transfer of data to processor;
Processor receives view data and calculates the brightness value of present image, camera is set simultaneously returns the low-power consumption standby state;
Relatively whether the present image brightness value is greater than the brightness value that sets in advance;
If, then reduce the backlight illumination grade, if not, then increase the backlight illumination grade.
Another that the technical program had is characterised in that the output format of camera image data is the yuv formats that comprise luminance signal, and processor calculates the present image brightness value to the averaging of luminance signal of each pixel of camera image data that receives.
Another that the technical program had is characterised in that and adopts the multistage adjusting of backlight illumination, is preferably three grades of adjustings of backlight illumination, is provided with high luminance values and low brightness values.
Another that the technical program had is characterised in that the method for three grades of adjustings of backlight illumination may further comprise the steps:
Judge that whether the current brightness value that calculates is more than or equal to default high luminance values;
If then KBD-LIGHT is closed, the LCD high-high brightness grade that is set to backlight;
If not, continue then to judge that whether the current brightness value that calculates is more than or equal to low brightness values;
If then KBD-LIGHT is closed, the LCD intermediate light grade that is set to backlight;
If not, then KBD-LIGHT is opened, the LCD higher brightness grade that is set to backlight.
With a kind of mentality of designing, this programme proposes the self-regulating mobile phone of a kind of backlight illumination according to the self-regulating method of above-mentioned backlight illumination, comprises and passes through I
2The processor of C bus configuration camera parameter, camera is in low power consumpting state during standby, processor disposes the camera collection current image date and is transferred to processor by line synchro and data/address bus during the generation incident, processor calculates through image data illumination, connects and the control backlight circuit by the GPIO line.
Described backlight circuit comprises keyboard back light circuit and LCD display backlight circuit, and processor configuration camera adopts resolution and the 10fps frame transmission speed of QQVGA when taking pictures.
The present invention contrasts the technical scheme of mentioning in the background technology, advantage that it has and effect are exactly not increase hardware cost, avoid adopting the influence of light-sensitive device fully, can also effectively reduce the mobile phone power consumption of bringing backlight simultaneously, increase the cell phone standby time handset structure.
Description of drawings
Fig. 1 is that circuit of the present invention connects block diagram;
Fig. 2 is overall flow figure of the present invention.
Fig. 3 is an embodiment flow chart of brightness regulation of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
As shown in Figure 1, the processor in the 1 expression mobile phone, 2 expression cameras, 3 expression backlight circuits.Processor 1 passes through I
2The various running parameters of C bus configuration camera 2, and required system clock CLK, reset signal RESET and low-power consumption PDWN signal when producing camera 2 operating states, and the view data that camera 2 is gathered is transferred to processor 1 by position/horizontal/vertical synchronization line P/H/VSYN and data/address bus DATA.Processor 1 is controlled backlight circuit 3 on the mobile phone by the GPIO connecting line, backlight circuit 3 comprises keyboard back light circuit and LCD backlight illumination regulating circuit, wherein keyboard back light has two-stage brightness, perhaps complete bright or go out entirely, LCD is backlight to have 16 grades of brightness (to select backlight driving chip AAT3155 for use, 1 grade is high-high brightness, and 16 grades is minimum brightness).
It is several that the view data output format of mobile phone cam can be configured to yuv format, rgb format, original rgb format etc. usually.The handset processes device is handled the luminance signal of camera collection for convenience, selecting the data output format of configuration camera is yuv format, wherein Y is a luminance signal, and U and V are color difference signal, and the handset processes device can directly be handled the Y-signal in the data like this.If the camera to certain model can only be configured to the rgb format view data, the handset processes device also can be converted to luminance signal to rgb signal, but needs to increase the workload and the data processing time of mobile phone internal calculation.
The power consumption size of mobile phone cam operation is closely related with the resolution and the frame speed of images, image resolution ratio commonly used has SXGA (1280 * 1024), SVGA (800 * 600), VGA (640 * 480), QVGA (320 * 240), CIF (352 * 288), QCIF (176 * 144), QQVGA all kinds such as (160 * 120), and frame speed commonly used has 30fps, 15fps, 10fps, 7.5fps, 5fps etc.For reducing mobile phone cam needed power consumption when adjusting is backlight automatically, should select lower resolution and frame speed for use.This example is selected the plain camera OV7670 of 30 everythings for use, when adjusting is backlight automatically, selects QQVGA resolution for use, the frame speed of 10fps.
The reduction of camera quiescent dissipation can or be cut off the camera power supply and realize by control PDWN pin.Consider that cutting off the camera power supply will cause reinitializing the long time of camera needs, can't satisfy the needs of fast detecting ambient brightness, so the preferred mode of processor control PDWN pin that adopts makes camera enter low-power consumption mode among the present invention, like this, when the needs camera entered operating state collection and transmit image data, each parameter of camera register need not to reconfigure.
As shown in Figure 2, be method flow diagram of the present invention.
Step 201: it is the low-power consumption standby pattern that camera is set.
In the starting stage, processor passes through I
2The resolution of C bus configuration camera is QQVGA, frame speed is 10fps, data output format is 8 yuv formats, processor is put height to PDWN then, make camera enter low power consumpting state and stop CLK and export, also enter holding state with preprocessor self, the current drain of camera is about 20uA at this moment.
Step 202: judged whether that button or incoming call incident take place.
Because certain incident takes place, press or incident such as phone incoming call is arranged as mobile phone key, need mobile phone open keyboard back light and LCD backlight.Need incident backlight to take place if having, then enter 203 steps, if do not have, then camera is in the low-power consumption standby pattern.
Step 203: the camera collection view data and transfer of data to processor.
Handset processes device configurable clock generator CLK exports and PDWN is put low again, and camera enters operating state immediately, and images acquired and output image are to processor.For yuv format, per 2 pixels of camera output are with 2 Y bytes, a U byte, a V byte representation, the actual Y0 U0 Y1 V0 Y2 U2 Y3 V2 that is output as of camera ... (Y0, U0, V0 represent the YUV component of first pixel, and Y1, Y2 etc. are by that analogy).
Step 204: processor receives view data and also calculates brightness value, and camera is set returns holding state.
Processor receives the brightness that begins to calculate present image behind the image.For the data of the yuv format that receives, the calculating of present image brightness L can be passed through following formula: L=(Y0+Y1+ ... + Y19119)/19200 obtain the mean flow rate of current environment, also can obtain the mean flow rate of current environment by other similar formula.Because brightness data is 8 bit data, so the maximum occurrences of L is 255 (representing Quan Liang), minimum value is 0 (representative is complete dark).
Simultaneously processor is put height by the PDWN signal and is controlled camera and reenter low power consumpting state.Under mobile phone situation about opening backlight, for reducing power consumption and the purpose that prevents interference camera backlight, camera should be in the holding state of low-power consumption.
Step 205: the current brightness value that judgement is calculated and the size of default brightness value.
Mobile phone inside sets in advance user's acceptable ambient brightness value, after processor calculates current brightness value, judge the size of two brightness values, if current brightness value is greater than the brightness value that sets in advance, illustrate that then ambient brightness is enough, then execution in step 206, need mobile phone to reduce the backlight illumination grade and reach the effect that reduces system power dissipation, if current brightness value is smaller or equal to the brightness value that sets in advance, the ambient brightness deficiency is described, then execution in step 207, need mobile phone to improve the backlight illumination grade and reach good display.
The mode of mobile phone backlight illumination adjustment can be carried out various settings according to actual conditions.After having obtained current environment brightness, can realize the multistage automatic adjusting of mobile phone backlight illumination as required.As shown in Figure 3, be the method for preferred a kind of cell phone keyboard and LCD three grades of automatic brightness adjustment backlight among the present invention.Ambient brightness is through calculating, and numerical value wherein 255 is represented Quan Liang between 0-255, and minimum value 0 representative is complete dark.
Step 301: judge that whether the current environment brightness value L is more than or equal to 200;
Calculate the current environment brightness value L, if present embodiment is set L＞=200, then current environment belongs to the very bright occasion of ambient brightness, keyboard light need not to light the keyboard that also is convenient to operation, LCD is backlight should be with lit at maximum brightness to strengthen the lcd screen visuality, and situations such as reduction sunlight direct projection are to the influence of handset displays.
When concrete operations, carry out 302 steps, mobile phone in the present embodiment is can closing keyboard backlight and LCD brightness degree backlight is set is 1 grade, 1 grade of high-high brightness grade that brightness degree is a LCD display wherein, LCD backlight illumination grade is set to 1 grade-5 grades, and backlight illumination is the bright degree of successively decreasing successively along with the increase of grade numeral.
Step 303: judge that whether the current environment brightness value L is more than or equal to 70;
If the current environment brightness value L is 70=＜L＜200, illustrate that then current environment belongs to the moderate occasion of ambient brightness, keyboard light need not to light the keyboard that also is convenient to operation, and the LCD intermediate light that should adopt backlight is lighted.
When concrete operations, carry out 304 steps, mobile phone can the closing keyboard LCD brightness degree backlight that is provided with simultaneously backlight be 5 grades in the present embodiment.
If the current environment brightness value L, then illustrates current environment less than 70 and belongs to the darker occasion of ambient brightness,, keyboard light need be lighted with user-friendly, and LCD is backlight should to be lighted strengthening display effect with higher brightness,
When concrete operations, carry out 305 steps, can to open keyboard back light and LCD brightness degree backlight is set be 3 grades to mobile phone in the present embodiment.
More than be an embodiment of three grades of automatic brightness adjustment; and be not to be restriction to the technical program; those of ordinary skills know; the self-regulating technical scheme of this backlight illumination has many distortion and variation and does not break away from spirit of the present invention; remodeling or the replacement made in essential scope of the present invention also should belong to protection scope of the present invention.
Adopting this embodiment, is QQVGA selecting resolution for use, and frame speed is under the situation of 10fps, and the whole power consumption of camera is less than 10mA after tested, and whole standby-take pictures-standby process can be finished in 0.5 second.If the backlight time of lighting is 15 seconds, adopt brightness to detect the back back facet current integral body 20mA that descended, then overall power saving is 20-10*0.5/15=19.67mA.That is to say that the power consumption that the camera application is increased descends and can ignore for the power consumption of integral body.
The present invention adopts mobile phone cam to replace light-sensitive device realization mobile phone backlight illumination to regulate automatically, though the camera collection image has increased certain power consumption, with respect to the reduction of back facet current, the power consumption of increase almost can be ignored.So just do not increasing hardware cost, effectively reducing mobile telephone power consumption under the fairly simple situation of software solution, increasing the cell phone standby time, can avoid adopting simultaneously the influence of light-sensitive device fully handset structure.
In actual use, there is certain influence the position of camera in mobile phone for the luminance acquisition precision, and optimal camera position is in the mobile phone front, can obtain monochrome information comparatively accurately.Along with the 3G epoch at hand, the mobile phone that possesses dual camera will be popular gradually, and one of them camera is used for outer the bat, and the another one camera is used for video calling, the technical program is particularly suitable for this type of mobile phone, but also can extensive use on the other types mobile phone.
Claims (10)
1. the self-regulating method of mobile phone backlight illumination is characterized in that may further comprise the steps:
It is the low-power consumption standby pattern that the handset processes device is provided with camera;
Judge whether that event occurs, such as key-press event or phone incoming call incident;
If event occurs, then processor is provided with camera and enters operating state, the camera collection view data and transfer of data to processor;
Processor receives view data and calculates the brightness value of present image, camera is set simultaneously returns the low-power consumption standby state;
Relatively whether the present image brightness value is greater than the brightness value that sets in advance;
If, then reduce the backlight illumination grade, if not, then increase the backlight illumination grade.
2. the self-regulating method of mobile phone backlight illumination according to claim 1, the output format that it is characterized in that the camera image data is the yuv format that comprises luminance signal.
3. according to claim 1 or the self-regulating method of 2 described mobile phone backlight illuminations, it is characterized in that processor calculates the present image brightness value to the averaging of luminance signal of each pixel of camera image data that receives.
4. the self-regulating method of mobile phone backlight illumination according to claim 1 is characterized in that adopting the multistage adjusting of backlight illumination.
5. the self-regulating method of mobile phone backlight illumination according to claim 4 is characterized in that adopting three grades of adjustings of backlight illumination, is provided with high luminance values and low brightness values.
6. according to claim 1 or the self-regulating method of 5 described mobile phone backlight illuminations, it is characterized in that may further comprise the steps:
Judge that whether the current brightness value that calculates is more than or equal to default high luminance values;
If then KBD-LIGHT is closed, the LCD high-high brightness grade that is set to backlight;
If not, continue then to judge that whether the current brightness value that calculates is more than or equal to low brightness values;
If then KBD-LIGHT is closed, the LCD intermediate light grade that is set to backlight;
If not, then KBD-LIGHT is opened, the LCD higher brightness grade that is set to backlight.
7. self-regulating mobile phone of backlight illumination is characterized in that comprising and passes through I
2The processor of C bus configuration camera parameter, camera is in low power consumpting state during standby, processor disposes the camera collection current image date and is transferred to processor by line synchro and data/address bus during the generation incident, processor calculates through image data illumination, connects and the control backlight circuit by the GPIO line.
8. the self-regulating mobile phone of backlight illumination according to claim 7 is characterized in that described backlight circuit comprises keyboard back light circuit and LCD display backlight circuit.
9. the self-regulating mobile phone of backlight illumination according to claim 7 is characterized in that described processor configuration camera adopts resolution and the 10fps frame transmission speed of QQVGA when taking pictures.
10. according to claim 7 or the self-regulating mobile phone of 9 described backlight illuminations, it is characterized in that the view data of camera output is the yuv format that comprises luminance signal.
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